Install RVM

The following downloads and executes the RVM installer

$ bash -s stable < \
   <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

I explain what this oneliner does:

1. The command in <(...) is executed and its output is made available through a file descriptor like /dev/fd/$id (Bash guide)

2. This filename becomes the argument of standard input redirection (it’s the first < )

3. The downloaded data (which is the output of curl) happens to be a Bash script, so it’s executed from bash and it’s passed stable parameter (that’s what -s is for)

4. The stable branch of RVM is finally installed

Run the following as the installer suggests

$source ~/.rvm/scripts/rvm

Finally append this to .bashrc

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

Each Ruby interpreter depends on some other software. RVM suggests what to install, depending on your operating system

$rvm requirements